I know about the ROM samples, still looking for the ones extracted by Collin.
I had a TR-8 and it was fun, have seen the TR-9 and I might end up with one.
I've played with several sample packs, have a TR-909 kit in my Integra-7 as well, but it just surpises me that no one seems to have done an analog attempt together with the rom samples for the most authentic kit. We have this great analog drum machine and everyone settles with samples.
I'm not talented enough to get close to the 909 synthesized sounds. But I'm just suprised that no one has done it so far.
Regarding the tone, I feel the RYTM lacks midrange, it can be really wooly and dark warm with loads of bass. Or glitchy with resonant, but suffers a bit in the palette inbetween (from a synth perspective that is) I hear that in all the sounds of the different projects, but also find it when trying to program myself. Except for samples ofcourse.